[Symbiote]

Is there a list of Danish ISPs that do this?

I've had YouSee since I moved here, and I have a single public IPv4. I didn't realise that was not standard.

[fogihujy]

When I lived in Denmark, 3 would often use carrier-grade NAT, but not always. Based on talk with colleagues back then, it's quite common with mobile broadband.

Here in Finland, the situation is similar; when using mobile broadband you usually end up behind CGNAT.

Luckily, most ISP's will happily provide a static IPv4 for you for a small fee.